10G/40G/100G Transmission type

1. Traditional 10G often uses SFP+ optical modules and dual-core LC interface interconnection;

2. The 40G Ethernet specification requires 8-core interconnection, 4 transmissions and 4 receptions, and a 12-core optical cable wiring solution. Each channel has 4 dedicated launch fibers and 4 dedicated reception fibers, and the 4 fibers in the middle remain idle;

3. The 100G Ethernet common solution stipulates that 24 optical fibers are used, divided into two 12-core arrays, one array is dedicated to transmitting, the other is dedicated to receiving, and the middle of each array is used to transmit traffic with 10 optical fibers, and both ends 2 optical fibers are idle.

In traditional serial transmission, data is transmitted through a pair of optical fibers, one for transmission (Tx) and one for reception (Rx). At transmission speeds of 1G and 10G, the choice of transceiver is not critical, because all transceivers operate in the same way and at the same wavelength. When the network speed gradually increased to 40/100G, different (proprietary) WDM technologies appeared on the market. After that, the choice of transceivers became more critical, because some transceivers use two different wavelengths, and some transceivers The use of four different wavelengths makes them incompatible with the IEEE-approved SR4 protocol using parallel optical transmission.

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